scholarly journals Silicon nanowires based adsorption sensors for CO and NH3 detection

2021 ◽  
Vol 2103 (1) ◽  
pp. 012229
Author(s):  
V M Kondratev ◽  
I A Morozov ◽  
E A Vyacheslavova ◽  
A S Gudovskikh ◽  
S S Nalimova ◽  
...  
Keyword(s):  
Carbon Monoxide ◽  
Liquid Medium ◽  
Surface Area ◽  
Human Body ◽  
Silicon Nanowires ◽  
High Surface ◽  
High Surface Area ◽  
Si Nanowires

Abstract Carbon monoxide and ammonia are inorganic agents found both in nature and in the human body, which is of great interest for modern sensing. The work is aimed at fabrication and study of precise, technological and relatively cheap multi-environment sensors based on Si nanowires possessing high surface area compatible with a gas and liquid medium for CO and NH3 detection, respectively. We demonstrate the potential of the approach for detection of both ammonia and CO at concentrations as low as 10ppm. The effects of the adsorbates from water and air are discussed.

scholarly journals Mesoporous High-Surface-Area Copper-Tin Mixed-Oxide Nanorods: Remarkable for Carbon Monoxide Oxidation

ChemCatChem ◽  
2016 ◽  
Vol 8 (14) ◽  
pp. 2329-2334 ◽  
Author(s):  
Honggen Peng ◽  
Yang Liu ◽  
Yarong Li ◽  
Xianhua Zhang ◽  
Xianglan Tang ◽  
...  
Keyword(s):  
Carbon Monoxide ◽  
Surface Area ◽  
Mixed Oxide ◽  
High Surface ◽  
High Surface Area ◽  
Carbon Monoxide Oxidation ◽  
Oxide Nanorods

scholarly journals The Geode Process I: Hollow Silica Microcapsules as a High Surface Area Substrate for Semiconductor Nanowire Growth

2019 ◽  
Author(s):  
Maritza Mujica ◽  
Gozde Tutuncuoglu ◽  
Amar Mohabir ◽  
Victor Breedveld ◽  
Sven Behrens ◽  
...  
Keyword(s):  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Silica Particles ◽  
Nanowire Growth ◽  
Si Nanowires ◽  
Hollow Silica ◽  
Semiconductor Nanowire ◽  
Interior Surface ◽  
Emulsion Templating

<div><div><div><p>We introduce and demonstrate critical steps toward the Geode process for the bottom-up synthesis of semiconductor nanowires. Central to the process is the design and fabrication of an unconventional, high surface area substrate: the interior surface of hollow silica microcapsules, assembled from silica particles via emulsion templating, and featuring porous walls to enable efficient gas transport. The interior surface of these hollow silica microcapsules is decorated with gold nanoparticles that seed nanowire growth via the vapor-liquid-solid (VLS) mechanism. We demonstrate the production of the necessary microcapsules and show how microcapsule structure and stability upon drying is influenced by the type of silica particles and use of a particle cross-linking agent. Finally, we demonstrate the synthesis of Si nanowires in the microcapsule interior.</p></div></div></div>

scholarly journals Silicon nanowires as multi—environment sensor elements for carbon monoxide and ammonia detection

2021 ◽  
Vol 2015 (1) ◽  
pp. 012068
Author(s):  
V. M. Kondratev ◽  
I.A. Morozov ◽  
E.A. Vyacheslavova ◽  
A. S. Gudovskikh ◽  
S. S. Nalimova ◽  
...  
Keyword(s):  
Carbon Monoxide ◽  
Liquid Medium ◽  
Human Health ◽  
Human Body ◽  
Silicon Nanowires ◽  
Ammonia Detection

Abstract Carbon monoxide and ammonia are inorganic agents found both in nature and in the human body, which is of great interest for modern sensing. First, in concentrations of the order of 1 ppm agents are produced by human and can be markers of changes in human health. Second, at concentrations of the order of 100 ppm, carbon monoxide and ammonia are toxic and hazardous. This work is aimed at fabrication and study of precise, technological and relatively cheap sensors compatible with a gas and liquid medium for CO and NH3 detection, respectively.

scholarly journals Carbon monoxide oxidation on Pt-Ru electrocatalysts supported on high surface area carbon

2002 ◽  
Vol 13 (4) ◽  
Author(s):  
Flavio Colmati Jr. ◽  
William H. Lizcano-Valbuena ◽  
Giuseppe A. Camara ◽  
Edson A. Ticianelli ◽  
Ernesto R. Gonzalez
Keyword(s):  
Carbon Monoxide ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Carbon Monoxide Oxidation

scholarly journals COVID-19 Prevention: Role of Activated Carbon

2021 ◽  
Vol 53 (4) ◽  
pp. 210404
Author(s):  
Md Sumon Reza ◽  
ABM Kamrul Hasan ◽  
Abu Saleh Ahmed ◽  
Shammya Afroze ◽  
Muhammad Saifullah Abu Bakar ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Surface Area ◽  
Functional Groups ◽  
Human Body ◽  
High Surface ◽  
High Surface Area ◽  
Preliminary Stage ◽  
Novel Virus

Recently, Coronavirus Disease 2019 (COVID-19) has brought the whole world into a pandemic condition, where the number of infected cases and deaths is exponentially high. A number of vaccines are available for this novel virus, but these are in the preliminary stage and are also not available to everyone. As the virus is very contagious, protection and prevention are the best way to survive and get rid of this disease. The virus affects the human body by entering through the nose, mouth, and eyes, so face protection with an appropriate mask is highly advisable. Combined masks made with activated carbon (AC) can effectively adsorb the virus because of its high surface area and broad functional groups. Such combined masks can also control coronavirus transmission by capturing harmful gases and smoke as they help in decreasing the spread of the virus

scholarly journals The Geode Process I: Hollow Silica Microcapsules as a High Surface Area Substrate for Semiconductor Nanowire Growth

2019 ◽  
Author(s):  
Maritza Mujica ◽  
Gozde Tutuncuoglu ◽  
Amar Mohabir ◽  
Victor Breedveld ◽  
Sven Behrens ◽  
...  
Keyword(s):  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Silica Particles ◽  
Nanowire Growth ◽  
Si Nanowires ◽  
Hollow Silica ◽  
Semiconductor Nanowire ◽  
Interior Surface ◽  
Emulsion Templating

<div><div><div><p>We introduce and demonstrate critical steps toward the Geode process for the bottom-up synthesis of semiconductor nanowires. Central to the process is the design and fabrication of an unconventional, high surface area substrate: the interior surface of hollow silica microcapsules, assembled from silica particles via emulsion templating, and featuring porous walls to enable efficient gas transport. The interior surface of these hollow silica microcapsules is decorated with gold nanoparticles that seed nanowire growth via the vapor-liquid-solid (VLS) mechanism. We demonstrate the production of the necessary microcapsules and show how microcapsule structure and stability upon drying is influenced by the type of silica particles and use of a particle cross-linking agent. Finally, we demonstrate the synthesis of Si nanowires in the microcapsule interior.</p></div></div></div>

Restructuring of ultra-thin branches in multi-nucleated silicon nanowires

2020 ◽  
Vol 92 (12) ◽  
pp. 1921-1928
Author(s):  
Youjin V. Lee ◽  
Lingyuan Meng ◽  
Eleanor Ostroff ◽  
Bozhi Tian
Keyword(s):  
Energy Harvesting ◽  
Surface Area ◽  
Silicon Nanowires ◽  
Ostwald Ripening ◽  
High Surface ◽  
High Surface Area ◽  
Semiconductor Nanowires ◽  
Tree Structures

AbstractThe synthetic tunability of semiconductor nanowires has enabled researchers to apply these materials in a variety of applications from energy harvesting to biological stimulation. One of the most intensely researched areas is the synthesis of branched nanowires, or nano-tree structures, owing to their high surface area. In this paper, we present a synthetic protocol that enables the growth of ultra-thin nanowire branches on a primary nanowire. Specifically, the method yields tightly distributed branches, whose locality is unique to our method. We furthermore induce the transformation of these branches into spheroidal superstructures. We explain how an Ostwald ripening-like mechanism can account for such a transformation. We suggest how our method can expand the synthetic toolset of branched nanowires, thus enabling the development of applications.

Tenacious Mass Transfer Limitations Drive Catalytic Selectivity during Electrochemical Carbon Dioxide Reduction

2019 ◽  
Author(s):  
Kailun Yang ◽  
Recep Kas ◽  
Wilson A. Smith
Keyword(s):  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Catalyst Layer ◽  
Active Surface ◽  
Active Surface Area ◽  
High Concentration ◽  
Copper Electrodes ◽  
Surface Enhanced ◽  
Local Current

<p>This study evaluated the performance of the commonly used strong buffer electrolytes, i.e. phosphate buffers, during CO<sub>2</sub> electroreduction in neutral pH conditions by using in-situ surface enhanced infrared absorption spectroscopy (SEIRAS). Unfortunately, the buffers break down a lot faster than anticipated which has serious implications on many studies in the literature such as selectivity and kinetic analysis of the electrocatalysts. Increasing electrolyte concentration, surprisingly, did not extend the potential window of the phosphate buffers due to dramatic increase in hydrogen evolution reaction. Even high concentration phosphate buffers (1 M) break down within the potentials (-1 V vs RHE) where hydrocarbons are formed on copper electrodes. We have extended the discussion to high surface area electrodes by evaluating electrodes composed of copper nanowires. We would like highlight that it is not possible to cope with high local current densities on these high surface area electrodes by using high buffer capacity solutions and the CO<sub>2</sub> electrocatalysts are needed to be evaluated by casting thin nanoparticle films onto inert substrates as commonly employed in fuel cell reactions and up to now scarcely employed in CO<sub>2</sub> electroreduction. In addition, we underscore that normalization of the electrocatalytic activity to the electrochemical active surface area is not the ultimate solution due to concentration gradient along the catalyst layer.This will “underestimate” the activity of high surface electrocatalyst and the degree of underestimation will depend on the thickness, porosity and morphology of the catalyst layer. </p> <p> </p>

scholarly journals Rugae-like FeP nanocrystal assembly on a carbon cloth: an exceptionally efficient and stable cathode for hydrogen evolution

Nanoscale ◽  
2015 ◽  
Vol 7 (25) ◽  
pp. 10974-10981 ◽  
Author(s):  
Xiulin Yang ◽  
Ang-Yu Lu ◽  
Yihan Zhu ◽  
Shixiong Min ◽  
Mohamed Nejib Hedhili ◽  
...  
Keyword(s):  
Gas Phase ◽  
Surface Area ◽  
Hydrogen Evolution ◽  
Hydrogen Generation ◽  
High Surface ◽  
High Surface Area ◽  
Catalytic Efficiency ◽  
Carbon Cloth ◽  
Nanocrystal Assembly

High surface area FeP nanosheets on a carbon cloth were prepared by gas phase phosphidation of electroplated FeOOH, which exhibit exceptionally high catalytic efficiency and stability for hydrogen generation.

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